The Submillimeter Array (SMA) is an 8-element radio interferometer
located atop Mauna Kea in Hawaii. Operating at frequencies from 180 GHz
to 900 GHz, the 6m dishes may be arranged into configurations
with baselines as long as 500m, producing a synthesized beam of sub-arcsecond
width. Each element can observe with two receivers simultaneously,
with 2 GHz bandwidth each. The digital correlator backend allows
flexible allocation of thousands of spectral channels to each receiver.
The Submillimeter Array is a joint venture of the Smithsonian Astrophysical
Observatory and the Academia Sinica Institute of Astronomy and Astrophysics.